EFFICIENT NUMERICAL CAD TECHNIQUE FOR RF AND MICROWAVE-AMPLIFIERS

The real frequency technique (RFT) is an efficient numerical method to design the matching networks of microwave active circuits. It provide s several advantages over most of the usual techniques. By directly in cluding measured scattering and noise parameter data, it does not requ ire any rational functions or circuit models. Moreover, a predetermine d matching circuit topology is not necessary. The described method als o allows the design of stability-guaranteed broadband circuits when em ploying potentially unstable transistors. With the Levenberg-Merquardt algorithm, the RFT can be applied to simultaneously optimize transduc er power gain, input and output VSWRs, noise figure, and group delay o f a multistage microwave active circuit. Applications as different as wow-noise amplifier, active filter, or broadband amplifier are possibl e. (C) 1998 John Wiley & Sons, Inc.